Synergistic effect of Mn doping and hollow structure boosting Mn-CoP/Co2P nanotubes as efficient bifunctional electrocatalyst for overall water splitting

Internal and External Cultivation Strategy toward Efficient Electrochemical Oxygen Evolution in Cobalt Pentlandite

“…Further characterization of the elemental composition of V-CNFS/Ni 9 S 8 and (Co,Ni,Fe) 9 S 8 was performed via XPS. The XPS spectra of V-CNFS/Ni 9 S 8 in Figure (a) clearly showed characteristic peaks corresponding to Co, Ni, Fe, V, O, and S, while the total spectrum of CNFS did not contain any V peak, the presence of O 1s signal is due to the unavoidable oxidation of the sample by air or during the test . Specifically, the Co 2p spectrum shown in Figure (b) exhibited two peaks located at 777 eV (Co 2p 3/2 ) and 796.4 eV (Co 2p 1/2 ), indicating the presence of Co 2+ .…”

“…The XPS spectra of V-CNFS/Ni 9 S 8 in Figure 3(a) clearly showed characteristic peaks corresponding to Co, Ni, Fe, V, O, and S, while the total spectrum of CNFS did not contain any V peak, the presence of O 1s signal is due to the unavoidable oxidation of the sample by air or during the test. 20 Specifically, the Co 2p spectrum shown in Figure 3(b) exhibited two peaks located at 777 eV (Co 2p 3/2 ) and 796.4 eV (Co 2p 1/2 ), indicating the presence of Co 2+ . By comparison, the Co 2p orbital binding energy of V-CNFS/Ni 9 S 8 was shifted to a lower energy level than that of CNFS.…”

Quantum dot-doped CeOx–NiB with modulated electron density as a highly efficient bifunctional electrocatalyst for water splitting

“…14,15 The introduction of foreign elements can change the local electron density of pure materials, and doping elements can coordinate with the original elements to tune the hydrogen adsorption energy. 16–21 In recent years, it has been found that some rare earth metal materials, especially rare earth metal oxides, have certain potential as modifiers in improving the catalytic performance for the OER, although their autocatalytic performance is poor. 22,23 Recently, related reports have shown that the combination of transition metal materials with rare earth elements, that is, doping Ce or CeO 2 in the host catalyst to build a heterogeneous structure between the active catalysts, can significantly improve the electrocatalytic performance of HER/OER catalysts.…”

Ir-Doped Bilayer Heterojunction Hollow Nanoboxes for Electrocatalytic Oxygen Evolution

“…As a result, it is crucial to develop appropriate electrocatalysts that can expedite the sluggish kinetics of OER, thereby reducing overpotential and energy consumption . Noble metals and their oxides, such as IrO 2 and RuO 2 , are well-known catalysts with exceptional electrocatalytic properties for the OER. − Particularly, Ir has shown promising prospects as an OER electrocatalyst due to its high activity, stability, and corrosion resistance. − However, due to constraints such as scarce resources, high costs, and unsatisfactory cycle stability, their widespread application is hindered. Despite the considerable research on nonprecious metal electrocatalytic materials, their electrocatalytic performance still remains suboptimal. − Therefore, designing a reasonable synthesis strategy to prepare catalysts with ideal structures and high activity for the practical implementation of water decomposition remains a significant challenge …”